Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin-猫眼课题宝

DOI：

10.1051/0004-6361/201220739

发表时间：

2013-01

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

G. Maciejewski;Dinko Dimitrov;M. Seeliger;S. Raetz;Ł. Bukowiecki;M. Kitze;R. Errmann;Grzegorz Nowak;Andrzej Niedzielski;V. Popov;C. Marka;K. Goździewski;Ralph Neuhäuser;J. Ohlert;T. Hinse;J. W. Lee;C.‐U. Lee;Joh-Na Yoon;A. Berndt;H. Gilbert;C. Ginski;M. Hohle;M. Mugrauer;T. Roell;T. Schmidt;N. Tetzlaff;L. Mancini;J. Southworth;M. Dall’ora;S. Ciceri;R. Zambelli;G. Corfini;Hiromitsu Takahashi;K. Tachihara;J. Benkő;K. Sárneczky;Gy. M. Szabó;Gy. M. Szabó;T. Varga;M. Vaňko;Y. Joshi;Wen-Ping Chen

目标。凌日行星WASP-12 B被确定为凌日计时研究的潜在目标，因为文献中报告了偏离线性星历的情况。这种偏差可能是由系统中的另一颗行星引起的。我们试图确认声称的过境时间的变化，并解释其起源。方法.我们组织了一次多地点活动，利用0.5-2.6米望远镜在三个观测季节观测WASP-12 B凌日。结果我们获得了61个凌日光变曲线，其中许多具有亚毫米级的精度。最佳质量的数据集的同时分析，使我们能够获得细化的系统参数，这与以前的研究报告的值。相对于线性星历的残差揭示了一个可能的周期信号，该信号可以近似为WASP-12 B的振幅为0.00068 ± 0.00013 d、周期为500 ± 20个轨道周期的正弦曲线。对时间数据和公布的径向速度测量结果的联合分析得出了一个双行星模型，该模型比单行星模型更好地解释了观测结果。我们假设WASP-12 B可能不是该系统中唯一的行星，并且在3.6-d偏心轨道上可能存在额外的0.1 MJup天体。动力学分析表明，提出的双行星系统是稳定的长时间尺度。

Aims. The transiting planet WASP-12 b was identified as a potential target for transit-timing studies because a departure from a linear ephemeris has been reported in the literature. Such deviations could be caused by an additional planet in the system. We attempt to confirm the claimed variations in transit timing and interpret their origin. Methods. We organised a multi-site campaign to observe transits by WASP-12 b in three observing seasons, using 0.5–2.6-metre telescopes. Results. We obtained 61 transit light curves, many of them with sub-millimagnitude precision. The simultaneous analysis of the best-quality datasets allowed us to obtain refined system parameters, which agree with values reported in previous studies. The residuals versus a linear ephemeris reveal a possible periodic signal that may be approximated by a sinusoid with an amplitude of 0.00068 ± 0.00013 d and period of 500 ± 20 orbital periods of WASP-12 b. The joint analysis of timing data and published radial velocity measurements results in a two-planet model that explains observations better than do single-planet scenarios. We hypothesise that WASP-12 b might not be the only planet in the system, and there might be the additional 0.1 MJup body on a 3.6-d eccentric orbit. A dynamical analysis indicates that the proposed two-planet system is stable on long timescales.

Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin

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